// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once
#include <pollux/exec/operator.h>
#include <pollux/vector/flat_vector.h>

namespace kumo::pollux::exec {
    class AssignUniqueId : public Operator {
    public:
        AssignUniqueId(
            int32_t operatorId,
            DriverCtx *driverCtx,
            const std::shared_ptr<const core::AssignUniqueIdNode> &planNode,
            int32_t uniqueTaskId,
            std::shared_ptr<std::atomic_int64_t> rowIdPool);

        bool isFilter() const override {
            return true;
        }

        bool preservesOrder() const override {
            return true;
        }

        bool needsInput() const override {
            return true;
        }

        void addInput(RowVectorPtr input) override;

        RowVectorPtr getOutput() override;

        BlockingReason isBlocked(ContinueFuture * /*future*/) override {
            return BlockingReason::kNotBlocked;
        }

        bool isFinished() override;

    private:
        void generateIdColumn(vector_size_t size);

        void requestRowIds();

        const int64_t kRowIdsPerRequest = 1L << 20;
        const int64_t kMaxRowId = 1L << 40;
        const int64_t kTaskUniqueIdLimit = 1L << 24;

        int64_t uniqueValueMask_;
        int64_t rowIdCounter_;
        int64_t maxRowIdCounterValue_;

        std::shared_ptr<std::atomic_int64_t> rowIdPool_;
    };
} // namespace kumo::pollux::exec
